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The POR has to asserted for longer than 50ms after VDDIO has been attained so as to prevent a brownout. For this reason, the reference design of this chip includes an explicit voltage detector to ensure this. This is in particular critical for battery powered products. The voltage detector we recommend is Torex XC6119N16A7R-G. We also recommend TXC 7V24070013 as the 24MHz crystal with 10pF as the loading capacitors.